Add a warning and assert that inputs for get_msb must not be zero. Change-Id: I8c6f289ff13248f6e3a8bc24aab3712ed33022a6
Use system_state.h in vpx_dsp and remove unneeded includes of vp9_systemdependent.h. Change-Id: I92557ec6dd5aa790160b4f31fe7967db0d7ec3c4